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Discussion Starter · #1 ·
My 407 SW 2.0 hdi is running on reduced power.. nothing I have tried has helped! Now getting very frustrated with it and thinking I have bought a lemon!

I have replaced the Air Mass Meter, EGR valve, DPF Filter, Turbo solenoid, All vacuum pipes checked for leaks, Temp sensor cleaned with electrical cleaner and all of this still not boosting as it did.
Is there anything from the turbo to the intercooler that would cause a restriction in air flow? A flap that's stuck etc? been to three garages and no one can find the cause of the issue just say the turbo is OK must be something else.

I do get a P 0299 code that the turbo is low boost pressure and a p0402 error that there is to high an airflow through the EGR valve.

Where should I start to look for the cause of this?

Thanks.
 

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Hi & welcome.

Sorry to hear you're having so much trouble -- especially since you've don all the obvious things.

A possible next step could be to get it plugged into Peugeot Planet (link in my signature; if you're on my regular journey between Telford and Newbury then I'll come to you and do it for free)

Planet will give better error info and lets you do actuator tests, for example to test whether the EGR is really opening and closing as it's supposed to.

IIRC low boost is normally wastgete or vane actuation, the other one ought to be MAF sensor or EGR valve but of course they've been eliminated.
Very strange. :confused:
 

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Discussion Starter · #4 ·
Tried reving the engine to 4K and watched the air pipe from the inter cooler and it was almost pulled flat by the lack of air flowing through it. That's why I asked if there was any thing between the turbo ant the intercooler that could close down the supply of air?
 

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Tried reving the engine to 4K and watched the air pipe from the inter cooler and it was almost pulled flat by the lack of air flowing through it. That's why I asked if there was any thing between the turbo ant the intercooler that could close down the supply of air?
Disconnect the bottom pipe from the intercooler and rev it and see if it still sucks the top pipe flat.
 

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I've seen that on a 1.6, but not on the 2 litre, check the air doser (where the top intercooler pipe runs in to), there should be a couple of flaps in there that may affect things.

Might be worth checking the turbo vanes too, seen a collapsing pipe occur when the impeller is damaged on a 1.6hdi
 

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Hi , sorry to hear not solved. Only way is to put it on a Peugeot Planet / Diagbox. Other readers are far less reliable. The AA and a Bosch diagnostic specialist couldn't find what PP found. It's the only way. It's the first thing to do before commencing on any fixes, may have saved you money. Anyhow you're on the right path by using the forum.
 
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